Kotlin Facet: Reuse JvmTarget and LanguageVersion in facet configuration

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/DefaultValues.kt

@@ -34,8 +34,8 @@ open class DefaultValues(val defaultValue: String, val possibleValues: List<Stri
     )
 
     object JvmTargetVersions : DefaultValues(
-            "\"" + JvmTarget.DEFAULT.string + "\"",
-            JvmTarget.values().map { "\"${it.string}\"" }
+            "\"" + JvmTarget.DEFAULT.description + "\"",
+            JvmTarget.values().map { "\"${it.description}\"" }
     )
 
     object JsEcmaVersions : DefaultValues(

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/K2JVMCompiler.kt

@@ -134,7 +134,7 @@ class K2JVMCompiler : CLICompiler<K2JVMCompilerArguments>() {
             }
             else {
                 val errorMessage = "Unknown JVM target version: ${arguments.jvmTarget}\n" +
-                                   "Supported versions: ${JvmTarget.values().joinToString { it.string }}"
+                                   "Supported versions: ${JvmTarget.values().joinToString { it.description }}"
                 messageCollector.report(CompilerMessageSeverity.ERROR, errorMessage, CompilerMessageLocation.NO_LOCATION)
             }
         }